Re: [PATCH] x86/mm: Handle physical-virtual alignment mismatch in phys_p4d_init()

From: Dave Hansen
Date: Thu Jun 20 2019 - 10:48:13 EST

On 6/20/19 4:22 AM, Kirill A. Shutemov wrote:
> The commit relaxes KASLR alignment requirements and it can lead to
> mismatch bentween 'i' and 'p4d_index(vaddr)' inside the loop in
> phys_p4d_init(). The mismatch in its turn leads to clearing wrong p4d
> entry and eventually to the oops.

Just curious, but what does it relax the requirement to and from?

I'm just not clearly spotting the actual bug.